Process of making watchcases



Jime 28 ,"1927. 1,633,661

I l. DINSTMAN PROCESS OF MAKING WATCHCASES Filed July 1926 Zhwwntoz 95% Que (Mu jig/0Z4 Patented June 28, 1927.

UNITED STATES ISIDOR DINSTMAN, OF NEW YORK, N. Y., ASSIGNOR TO DIEL WATCH CASE COMPANY,

1,633,6511 PATENT OFFICE.

A CORPORATION OF NEW YORK.

PROCESS OF MAKING WATGHCASES.

Application filed July 27,

This invention relates to a watch case that is especially adapted for wrist watches and to the process of producing the same. By this invention, pieces are out or stamped out of sheet metal and bent so as toform watch cases with integral lugs extending therefrom for holding pins for ribbons or straps V to keep the watch on the wrist of the wearer. The lugs are formed of the same metal as the rest of the case, so that the necessity of welding or soldering lugs to the case is avoided, and, at the same time, the lugs are made integral with the rest of the watch case. i

It has been found that when watch cases are made of thin. metal with integral lugs of the same thickness as the rest of the metal, the lugs are weak and apt to become bent. By the present invention, this objection is overcome and the lugs are made considerably thicker than twice the thickness of the sheet metal and are, in effect, solid lugs without any open space between the sides thereof, thus producing thick rigid lugs of great strength that will securely retain the ribbon or strap holding pins in place.

The invention will be understood from the description in connection with the acco1npanying drawings, in which Fig. 1 is a plan 30 view of a piece of metal cut into shape forming a watch case; Fig. 2 is a plan view with the edges turnedv up showing one step of the process; Figs. 3 and 4 are sections along the lines 33 and L respectively, of Fig. 2; Fig. 5 is a plan view similar to Fig. 2 showing the completed article and Fig. 6 is a section along the line 6-6 of Fig. 5.

In the drawings, reference character 11 indicates a piece of metal that may have been cut out of a sheet metal strip, this piece 11 being of generally rectangular shape, and having extensions 12 atthe corners thereof. Each one of the extensions 12 is provided with lips 13 and 14: at the edges of the extensions. The piece 11 may be made with straight sides between the extensions 12,-or they may have opposite edges curved outwardly, as shown at 15, and have their ends formed along straight lines, as shown at 16. In order to form the watch case, the piece of metal 11 is placed in a properly shaped press and the edges bent upwardly to form a flange or rim 17 between the extensions 12, and the extensions 12 with the lips 13 and 14 thereof are bent upwardly to form the lugs,

1926. Serial No. 125,218.

as most clearly shown in Figs. 2, 3 and 4. These lugs extend outwardly from the edges of the flanges and are integral therewith, while the upper edges of these lugs extend beyond the upper edge of the flange or rim 17, as most clearly shown in Figs. 3 and 4. Each one of the lugs then consists of two side portions spaced apart a short distance.

The case is then put in a press that is provided with recesses into which the lugs eX- tend. The lugs are then pressed downwardly toward the bottom of the watch case, thus thickening the metal constituting the lugs, until the spaces between the sides are completely filled, thus forming solid lugs, as shown in Fig. 5, whose edges are flush with the upper edge of the flange 17, as shown in Fig.1).

The middle of the watch case may be cut away along the dotted line 18 in Fig. 2, to provide space 19 for the watch crystal, etc., and the lugs may be perforated-in order to enable ribbon or strap holding pins 20 to be inserted. 1

I claim:

1. The process of making a watch case which comprises cutting out a piece from sheet metal bending the edges to form a flange and integral lugs, and then thickenmg the metal that constitutes the lugs.

2. The process of making a' watch case which comprises cutting out a piece from sheet metal, bending he edges to form a flange and integral lugs, and then thickening the metal that constitutes the lugs by pressing the same transversely.

3. The process of making a watch case which comprises cutting out a piece from sheet metal, bending the edges to form a flange and integral lugs that extend outwardly from said flange and above the edge thereof, and then pressing the metal ofthe lugs downwardly edge of the flange.

1. The process of making a watch case which comprises cutting out a piece from sheet metal, bending the edges to form a flange and integral lugs that extend outwardly from said flange and above the edge into line with the upper thereof, and then pressing the metal of the lugs downwardly into line with the upper edge of the flange without materially changing the distance between the outside surfaces of said lugs.

ISIDOR DINSTMAN. 

